Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 412

www.dell.com | support.dell.com Note: The FTOS implementation of PVST+ uses IEEE 802.1s costs as the default costs. Other implementations use IEEE 802.1d costs as the default costs. If you are using Dell Force10 systems in a multi-vendor network, verify that the costs are values you intended. To change the port cost or priority of an interface, use the following commands: Task Change the port cost of an interface. Range: 0 to 200000 Default: refer to Table 23-2. Change the port priority of an interface. Range: 0 to 240, in increments of 16 Default: 128 Command Syntax spanning-tree pvst vlan cost spanning-tree pvst vlan priority Command Mode INTERFACE INTERFACE To view the values for interface PVST+ parameters, use the show spanning-tree pvst command (Figure 23-4). Configure an EdgePort The EdgePort feature enables interfaces to begin forwarding traffic approximately 30 seconds sooner. In this mode, an interface forwards frames by default until it receives a BPDU that indicates it should behave otherwise; it does not go through the Learning and Listening states. The bpduguard shutdown-on-violation option causes the interface hardware to be shutdown when it receives a BPDU. Only after you implement the bpduguard option is the interface placed in an Error Disabled state. When receiving the BPDU, the physical interface remains up and spanning-tree drops packets in the hardware after a BPDU violation. BPDUs are dropped in the software after receiving the BPDU violation. This feature is the same as PortFast mode in Spanning Tree. Caution: Configure EdgePort only on links connecting to an end station. EdgePort can cause loops if you enable it on an interface connected to a network. The enabling of BPDU Filtering stops sending and receiving of BPDUs on the port fast enabled ports. When both BPDU guard and BPDU filter are enabled on the port, BPDU filter takes the higher precedence. By default, BPDU filtering on an interface is disabled. To enable EdgePort on an interface, use the following command: Task Enable EdgePort on an interface. Command Syntax Command Mode spanning-tree pvst edge-port [bpduguard [shutdown-on-violation] | bpdufilter] INTERFACE To view the EdgePort status of each interface, use the show spanning-tree pvst command (Figure 23-4). 410 | Per-VLAN Spanning Tree Plus (PVST+)